.SUFFIXES:                       # remove all the implicit rules
.SECONDARY:                      # all files are intermediate (keep them)
.SECONDEXPANSION:                # usefull to automatically build obj directories
.PHONY: all tidy clean cleanall  # these targets are not files
all:                             # ensures that all is the main target

CC=gcc
CFLAGS=-Wall -Werror -std=c11
LDFLAGS=
LIBS=
DEP=.dependencies

V ?= 1

red     := \e[0;91m
green   := \e[0;92m
yellow  := \e[0;93m
blue    := \e[0;94m
magenta := \e[0;95m
cyan    := \e[0;96m
black   := \e[0m

print    = $(if $(filter 1,$(V)),@printf "$(value $1)%14s    $(black) %s\n" "$(2)" "$(3)" || exit 0)
Q        = $(if $(filter 0 1,$(V)),@)
dinfo    = $(if $(filter 3,$(V)),$(info $(1)))

gen-rule = $(call dinfo,$(1)) $(1)

all: main

main: main.o | $$(@D)/.
	$(call print,magenta,linking,$(notdir $@))
	$(Q)$(CC) $(LDFLAGS) -o $@ $^ $(LIBS)

define gcc-rule
$(call gen-rule,$(1): $(2) | $$$$(@D)/. 
	$$(call print,cyan,compiling,$$(notdir $$<))
	$$(Q)( [ -f $$(DEP) ] && grep -w "$$(@D)/.$$(*F).d" $$(DEP) >/dev/null ) || echo '-include $$(@D)/.$$(*F).d\nclean::\n\t$$$$(Q)rm -f $$(@D)/.$$(*F).d $$@' >> $$(DEP)
	$$(Q)$(3) -MMD -MP -MT "$$@" -MF "$$(@D)/.$$(*F).d" -c "$$<" -o "$$@")
endef

$(eval $(call gcc-rule,%.o,%.c,$$(CC) $$(CFLAGS)))

-include $(DEP)

print-%:
	$(call print,green,$*,[$($*)])

%/.:
	$(Q)mkdir -p $@

tidy:
	$(Q)rm -f *~ \#*

clean::
	$(Q)rm -f $(DEP)

cleanall: clean
	$(Q)rm -f main